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Matheson Tri-Gas Norfolk ASU

Industrial Gases, Norfolk, Nebraska. NPDES permit NE0139483, in force until Sep 30, 2028. Last 12 months: over a limit 5 times (last September 2026), 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 89 days after each period: form M quarterly (16 values)
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 0 required values missing, 3 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, monthly average< .02 mg/L≤ .018 mg/L11%
June 2026Chlorine, total residual, monthly average< .02 mg/L≤ .018 mg/L11%
July 2026Chlorine, total residual, monthly average< .02 mg/L≤ .018 mg/L11%
August 2026Chlorine, total residual, monthly average< .02 mg/L≤ .018 mg/L11%
September 2026Chlorine, total residual, monthly average.02 mg/L≤ .018 mg/L11%

Limits in force (36)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year
Temperature, water deg. fahrenheitdaily maximum≤ 90 deg Fall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Iron, dissolved [as Fe]monthly average≤ 14.894 mg/LJun–Oct
Iron, dissolved [as Fe]monthly average≤ 20.941 mg/LMar–May
Iron, dissolved [as Fe]monthly average≤ 23.5 mg/LJan, Feb, Nov, Dec
Iron, dissolved [as Fe]daily maximum≤ 29.879 mg/LJun–Oct
Iron, dissolved [as Fe]daily maximum≤ 42.021 mg/LMar–May
Iron, dissolved [as Fe]daily maximum≤ 47.1 mg/LJan, Feb, Nov, Dec
Iron, dissolved [as Fe]monthly average≤ 2.19 kg/dJun–Oct
Iron, dissolved [as Fe]monthly average≤ 3.07 kg/dMar–May
Iron, dissolved [as Fe]monthly average≤ 2.08 kg/dJan, Feb, Nov, Dec
Iron, dissolved [as Fe]daily maximum≤ 4.39 kg/dJun–Oct
Iron, dissolved [as Fe]daily maximum≤ 6.17 kg/dMar–May
Iron, dissolved [as Fe]daily maximum≤ 4.16 kg/dJan, Feb, Nov, Dec
Manganese, dissolved [as Mn]monthly average≤ 23.5 mg/LJan, Feb, Nov, Dec
Manganese, dissolved [as Mn]monthly average≤ 14.894 mg/LJun–Oct
Manganese, dissolved [as Mn]monthly average≤ 20.941 mg/LMar–May
Manganese, dissolved [as Mn]daily maximum≤ 47.1 mg/LJan, Feb, Nov, Dec
Manganese, dissolved [as Mn]daily maximum≤ 29.879 mg/LJun–Oct
Manganese, dissolved [as Mn]daily maximum≤ 42.012 mg/LMar–May
Manganese, dissolved [as Mn]monthly average≤ 2.08 kg/dJan, Feb, Nov, Dec
Manganese, dissolved [as Mn]monthly average≤ 2.19 kg/dJun–Oct
Manganese, dissolved [as Mn]monthly average≤ 3.07 kg/dMar–May
Manganese, dissolved [as Mn]daily maximum≤ 4.16 kg/dJan, Feb, Nov, Dec
Manganese, dissolved [as Mn]daily maximum≤ 4.39 kg/dJun–Oct
Manganese, dissolved [as Mn]daily maximum≤ 6.17 kg/dMar–May
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .021 mg/LMar–May
Chlorine, total residualmonthly average≤ .018 mg/LJun–Oct
Chlorine, total residualmonthly average≤ .023 mg/LJan, Feb, Nov, Dec
Chlorine, total residualdaily maximum≤ .042 mg/LMar–May
Chlorine, total residualdaily maximum≤ .035 mg/LJun–Oct
Chlorine, total residualdaily maximum≤ .045 mg/LJan, Feb, Nov, Dec

How strict are these limits?

Cited limits by parameter: Nebraska's rules and the federal ones.

Same industry: the 31 Chemicals and Allied Products permits in Nebraska.

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Your permit document is the final word. As JSON: /api/v1/permits/NE0139483 · MCP: https://passage-data.com/mcp